Liquid oxygen (LOX) is a pale blue, extremely cold cryogenic liquid (a liquefied gas with a normal boiling point lower than -238°F or -150°C). Because of the vast temperature difference between the product and the surrounding environment, liquid oxygen must be insulated from surrounding heat.
Liquid oxygen is nonflammable, oxygen is a strong oxidizer and is a cryogenic liquid.
- Molecular formula: O2
- Molecular weight: 31.999
- Boiling point @ 1 atm: -297.4°F (-183.0°C, 90oK)
- Freezing point @ 1 atm: -361.9°F (-218.8°C, 54oK)
- Critical temperature: -181.8°F (-118.4°C)
- Critical pressure: 729.1 psia (49.6 atm)
- Density, liquid @ BP, 1 atm: 71.23 lb/scf
- Density, gas @ 68°F (20°C), 1 atm: 0.0831 lb/scf
- Specific gravity, gas (air=1) @ 68°F (20°C), 1 atm: 1.11
- Specific gravity, liquid (water=1) @ 68°F (20°C), 1 atm: 1.14
- Specific volume @ 68°F (20°C), 1 atm: 12.08 scf/lb
- Latent heat of vaporization: 2934 BTU/lb mole
- Expansion ratio, liquid to gas, BP to 68°F (20°C): 1 to 860
- Solubility in water @ 77°F (25°C), 1 atm: 3.16% by volume